US1071830A - Electric pump-governor. - Google Patents

Description

W. V. TURNER.

ELECTRIC PUMP GOVERNOR.

APPLICATION FILED APR. 10, 1909.

1,071,830, Patented Sept. 2, 15513.

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wmuesses v COLUMBIA PLANOGRAPH cuv WASHINGTON. n. c

WALTER v. TURNER, OF EDGEWOOD,

HOUSE AIR BRAKE COMPANY, 0]? or PENNSYLVANIA.

PENNSYLVANIA, ASSIGNOR TO THE WESTING- PITTSBURGH, PENNSYLVANIA, A CORPORATION ELECTRIC PUMP-GOVERNOR.

Specification of Letters Patent.

Patented Sept. 2, 1913.

Application filed April 10, 1909. Serial No. 489,093.

To all whom it may concern:

Be it known that I, WALTER V. TURNER, a citizen of the United States, residing at Edgewood, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Electric Pump- Governors, of which the following is a specification.

This invention relates to pressure governors, and more particularly to a pump governor of the type adapted for operating an electric switch, to control the circuit of an electric pump motor.

My invention is designed moreespecially to provide an improved electric pump governor capable of handling heavy currents and low voltages, such for instance, as met with in single phase electric installations.

One feature of my improvements contemplates the provision of means for efi'ecting a quick snap-like cutting 'in' action of the switch, so as to prevent the formation of destructive arcs such as are'otherwise liable to be produced when the switchfcontacts are brought together, especially where heavy currents and low voltages-are'employed;

. Another object of my invention isto provide means for causing the place of contact between the contact members of the switch to be shifted from the'portions of said' con} tact members at first engaging, to other ortions thereof, for the purpose of aflordin clean, smooth contactsurfaces for the fina contact, thereby obviating the tendency to form a poor connection at the switch due to pitting or roughness of the contact finger ends caused by fusing or burning.

Another object of my invention is to provide means for maintaining a heavy pressure between the switch contact members, when in engagement, so as to improve the conductivity and effectiveness of the switch connection.

' Another object of my invention is to provide a pump governor of generally improved construction.

Other features of importance will be referred to in the more detailed description of the invent-ion.

In the accompanying drawing; Figure 1 is a vertical section of an electric pump governor embodying my improvements; Fig. 2

a fragmentary sectional View of a portion of the electric switch mechanism, partly broken away, to show the spring device for the lower contact member; Fig. 3 a fragmentary elevational view of a portion of the switch mechanism, with the upper contact member removed; and Fig. 4 a view similar to Fig. 2, showin the relative position of the switch parts w en the contacts are separated.

As illustrated in Fig. 1 of the drawing, the governor may comprise a casing 1 havmg a cylindrical chamber containing a piston'2 whichdivides the chamber into an upper chamber 3 and a' lower chamber 4. The governorfalso comprises a valve casing 5 having a. chamber containing a movable abutment provided withftwo piston heads 6 and 7 operating respectively in piston cham' bers 8 and 9. 'The valve chamber 10 intermediate the heads 6 and? contains a main slidevalvei 'll and 'an'auxiliaryslide valve 12, mounted on 'thejmainjslide valve and havin "a movement relative thereto.

high tension'regulatin'g device com rismg a; I iaphragm 13,'subje,ct on one si eto pump"p'ressure"and on the pressure of an adjustable spring 14, operatesl'a "release valve 15 for releasing air from thecl i ambe'rfi at the outer face of pis ton a lovtr' p'ressure regulating device comprising. a diaphragm 16 subject on one side tapqmp pressure and on the opposite 'side to the pressure of an adjustable s pring'17operates a valve 18 for releasing air from piston'chamber 9 at the outer face of pistod head 7. I

According to my improvements, the switch piston '2is' provided with a central diiterential'piston head'19 operating in a piston chamber 20. The" piston chamber 4 communicates with a port 21, leading to the seat of the'main valve 11 and piston chamber 2 0 communicates with a passage 22 having port openings 23 into the piston chamber 3. The chamber 3'is provided with an atmospheric port 24 and'piston 2 is subject'to the pressure of two springs 25 and 26 contained in the chamber 3 and tending to move said piston to its inner position.

Piston rod 27 of the piston 2 carries a pivotally mounted lever 28 upon its outer end, suitably insulated from the piston rod and having one end provided with a contact member 29, the opposite end thereof being slotted for a fulcrum pin 30 mounted in a suitable bracket 31.

The other contact member the opposite side to,

32, of the lide val veil 6 Iaf bI v the pump motorcircuitithro switch, is secured to a pivoted arm 33,

mounted between standards 34 ofta' bracket-i 35,-so as to have.a vertical mov'ementfil A spring rod 36, subject to the pressure of a coil spring 37 is pivotally attache d to 'fli arm 33 and tends to force the arm and-its contact inan upward directionf The Tear ,Th a 3312M q i act .membem ifi eiie suitably insulated from the inaihfisiijg'pi governor a d avfl xi leacant i s bri connectssaid ar co d'pp t or'ca;

. cease 44? 1% mg a nozzle45 thr rgh '1ch,a r ;may be di to =q aahave; as; as p e- One .,e, the QP StQ i, a ts; I4 is v j th ni$ s,- f f?- i l fftlr fi in mm i in i th'apa s s li fire si r si h r ste 4 a J Posite m 9. id lti tq fiialto the pressure oflair admitt pa -u.

Inloperation, on the innerfifacenofpistonfl members 29 and 32,, as jshow n y pump motor then operatesth pump to comfpress air into the storage rese yti1gant1 the valve chamber 10 being in-communication with the reservoir through,passagel48,gthe fluid pressure therein rrses andf'equalizes around the piston headsQdzirid 7;." The, pressure being less than thetension of spring 17, the release valve 18 permitted to f open and fluid in chamber ,9 ventedto "theatmosp'nere, while the valve l 5 being closed, the fluid pressure which equalizes around the piston head 6 builds up the'pressu'rein chamber 8 and operatesito sl ift the main valve mechanism to its cut-in position, as shown in Fig. 1. In this positionga' cavity 50 in the main slide valve ll, connects port 21, leading to piston chamber}, waiterhaust port 51, and as piston chamber. 20 is open to the atmosphere throughpassage' 22 and ports 23, the full area of the piston 2 is now subject to atmospherie pressure/ As the pump pressure increases by o-peration of the pump, the lo'a pressure diaphragm first operates to closethe release Valve 18 and when the pump pressure slightly exceeds the tension of the high pressure spring 14, the diaphragm- 13 operates the release valve l5, '.:and air is-vented from piston chamber 8, through the passage 49; The main operating pisto ri the reilpon first moves the auxiliary valve 12 so that cavity 52 therein connects "a p'ort 53in the main slide valve ll with a -.po rt ,54.;; -,Ifort $3 being now in register with port 43 and port 54 being connected with a port 55, leading topistoirchamher 3, .communication isope n edfrom' the piston chamb er' fitdthe blowout piston valve 42, thereby permitting fluid 'under pressure in chamber 8 to tojthe piston valve 42 and this fluid atei s g p a en w ereas t l p n. a vent air through the blow-out passage 44 on tqthe, switch contacts. The movement of the" main' val'v ej mechanism v is thus accelgiia ed by t lie'lifentingfof fair to the'blow-out Iil 'fii it nii l ejvsat of a fthe lease'valve1'5. The continued movement of the grain piston; causes "tl1e shifting of the vallve ,ll -and port 56 therein is into: register with port 21; Air is then fadmittedffromf'the valve chamber 10 to' pist on chamber 4, and acting 9% piston ftorq es the same outwardly. The e e 'tjot main'valve'piston also 9P? i i member 29 rises and is followed up-b t he"contactjnember 32, the latter being yieldiri'glymressed upwardly by'the action of the spring 37, so that the contact members remain in'contact until the stop 38 on .tlie iar'm 33ehgages with the bracketstandaid 34," then thecontac'ts of'courseseparate and break the motor circuit upon the further upward movement of the contact member 29.

the piston 2 passes over one of the port openings 23, so that a communication is established from chamber 4 to passage 22 and thence to piston chamber 20. Now the port opening of passage 21 into chamber 4 is so restricted thatupon opening the port- 23 to said chamber, the efi'ect is that of opening a 'vent port fromthe chamber, as airfis not supplied through the restricted port 2l fast enough to make up for the increasedtpiston area open to fluid pressure and consequently the tendency of the piston to'accelerate its speed too rapidly is checked. It should be understood that the piston 2 still moves rapidly' enough to prevent-the formation of arcs as the switch contacts separate, but at QX little before the contact members separate,

the same time an excessively rapid' movement is prevented, as such movement is unnecessary and tends to cause pound ng and possible breakage of-parts. i

The piston valve 42, being subject to the 6 with a differential piston head portion 58 adapted to fit snugly within a piston 'cham ber 59. This piston chamber 59'communi-j cates with passage 49 leading to the'release valt'el5, so 'that whenever said-valve is opened, it will be seen that the'pressure' in chamber 59 is quickly reduced substantially to atmospheric pressure, rega-rdless of the.

pressure in chamber 8, thus facilitating the rapid movement of the main va'lve*p'arts. In the extremecut-out position of the main valve piston, the piston head '6 seats on an annular ring 60, and thus leakage of air from the piston chamber 8 and the main reservoir is prevented, during the time that the parts remain-in-the cut-out position. In moving to the cut-out position, the pistoii 2 passes over the port 46, and air is admitted from the piston valve air through the blow-out passage 44. As the pump pressure diminishes, the high tension diaphragm first permits the valve 15 to close and then when the pressure becomes slightly less than the tension of the low pressure spring 17, the release valve 18 opens and air is vented from the piston chamber 9, and the main valve mechanism instantly moves to its cut-in posit-ion, connecting the annular space 4 through passage 21 and cavity 50 with exhaust port 51. The venting of air from the space 4 causes the inward movement of piston 2, and, passing over the port openings 23, the movement of the piston 2 establishes communication from the central piston chamber 20 to the atmospheric port 24. This occurs when the contact 29 has moved to within a short distance of the contact 32, say about one-fourth of an inch, and thereupon, the sudden venting of air from the central piston chamber 20 causes the rapid movement of the piston, and thus the contact members of the switch are brought together with a quick, snap-like action. As the piston 2 continues its inward movement, the contact member 29 presses against the contact member 32 and moves the same inwardly against the resistance of the spring 37. The movement of each contact member about a different center is such piston chamber 4 to thespring side of the piston valve 42, thus permittingtho fluid pressures to equalize onopposite sides. thereof. The spring 47 will then close the 42 and prevent further flow-ofthat the contacts at first engage at the outer end portions,'-as indicated in Fig. 4, and then by a relative sliding or wiping and rolling movement finally assume the cut-in position, as shownin Fig. 1, in which the portions of the switch in contact are some distance back from the ends. In the cut-in position of the switch, the portion 61 of the switch arm 33 engages the stop 62 and so the pressure between the contacts at this time is equal to the pressure of the springs 25 and '26 less the pressure of. the spring 37, of course taking into consideration the leverage ofthe switch arm 28. In practice the springs are preferably made to exert a pressure of about 110 pounds and the piston stem 27 being'pivoted about midway on the lever 28, the. downward pressure on contact 29 is about 55 pounds. A heavy contact pressure is-thus. produced between the switch contacts when in the cut-in position, insuring'an :eflicient connection of good conductivity.

r It will now be apparent that a pump governor constructed according to my invention is adapted to effect the quick snap-like action ofthe switch in cutting-in and by shifting the relative place of contact of the switch contacts, a smooth, clean contact is insured, all of which tends to eliminate troubles due to arcing and poor contacts. Though of special utility in connection with theuse of heavy currents and low voltages, the construction may,of course, be employed generally with advantage.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A pressure governor comprising a controlling device, an actuating piston therefor, valve means governed by the pump pressure for supplying fluid to operate said piston, and means operated by the movement of said piston in one direction, for venting fluid from one side of the piston and by the movement of said piston in the opposite direction for supplying fluid to one side of the piston.

2. A pressure governor comprising a pump controlling device, an actuating piston therefor having two pressure receiving surfaces, a valve mechanism governed by the pump pressure for varying the fluid pressure on one surface, and means operated by the movement of said piston for varying the pressure on the other surface.

3. A pressure governor comprising a pump controlling device, an actuating piston therefor having two pressure receiving surfaces, a valve mechanism governed by the pump pressure for venting fluid from one surface, and means operated by the piston for venting fluid from the other surface to cause the sudden movement of said controlling the fluid pressure on said actuating piston, a blow-out valve means operated by fluid pressure, and an auxiliary valve having a movement relative to said main valve and operated by the preliminary movement of said abutment for venting fluid under pressure from one face of said abutment to said blow-out valve: means to operate the same.

6. A pressure governor comprising a controlling switch, an actuating piston therefor, valve means and anfabutment having two piston heads for'controlling the fluid pressure on said actuating piston, a release valve device governed bya-thepump pressure for venting fluid from one piston head, a blow-out valve means for the switch, and means operated by' -the'movementof said abutment for supplying air from the Copies of this patent may be obtained for five cents each; by addressing the I v "Washington, 11. 0; I

other piston head to said blow-out valve means.

7. A pressure governor comprising a controlling switch, therefor, a main valve and an abutment having two piston heads for controlling the fluid pressure for operating said actuating piston, a release valve device governed by pump pressure for venting fluid from one piston head, a blow-out valve means for the switch, and an auxiliary valve having a movement relative to the main valve and operated upon preliminary movement of said abutment for venting fluid from the other piston head to operate said blow-out valve means.

' 8. A pressure governor for pumps comprising a vpump controlling switch, an actuatingpiston therefor, a valve mechanism for controlling the fluid pressure on said actuating-"piston, means subject to pump pressure for venting fluid from said valve mechanism, and a blow-out valve means op erated, by fluid vented from said valve mechanism for supplying air to said switch. 7 In testimony whereof I have hereunto set myhandrr a. .u' ,WALTER V. TURNER. 2' Witnesses; v

M. M anr,

M. CLEMENTS.

iii Commissioner of Patents,

an actuating piston

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